Withthedevelopmentofmodernsociety,E-mailaswellasteleph...

问题详情：

 With the development of modern society, E-mail as well as telephones         ________ an important part in daily communication.

  A. have played     B. is playing      C. are playing   D. played

【回答】

B

知识点：主谓一致

题型：选择题